68195581 has 2 divisors, whose sum is σ = 68195582. Its totient is φ = 68195580.

The previous prime is 68195531. The next prime is 68195591. The reversal of 68195581 is 18559186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48080356 + 20115225 = 6934^2 + 4485^2 .

It is a cyclic number.

It is not a de Polignac number, because 68195581 - 2⁷ = 68195453 is a prime.

It is a super-2 number, since 2×68195581² = 9301274535855122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68195521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34097790 + 34097791.

It is an arithmetic number, because the mean of its divisors is an integer number (34097791).

Almost surely, 2^68195581 is an apocalyptic number.

It is an amenable number.

68195581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68195581 is an equidigital number, since it uses as much as digits as its factorization.

68195581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 43.

The square root of 68195581 is about 8258.0615764234. The cubic root of 68195581 is about 408.5564562987.

The spelling of 68195581 in words is "sixty-eight million, one hundred ninety-five thousand, five hundred eighty-one".